Vaisala SHM40 - Manual (Page 48)

USER'S GUIDE____________________________________________________________________
46 __________________________________________________________________ M211423EN-B
Pressure
In the Pressure setup screen, you can set the
current ambient pressure. The pressure
information is used when calculating certain
humidity quantities, such as mixing ratio
(symbol x).
If the ambient pressure differs significantly from
the default setting of 1.0132 bar (due to high
altitude, for example), set the correct pressure
value so that the HM40 indicator can calculate
the measurement correctly.
Backlight
Always on: Screen is always lit. This option will
shorten the battery life significantly.
Always off: Screen is always unlit. This option
provides the best battery life.
Delay (30s): Backlight will automatically turn on
when the user presses any button. The backlight
will turn off after 30 seconds of inactivity.
Dimmed: Screen is always lit with a dim
backlight.
Battery
Use the Battery setting to tell the HM40 what kind of batteries are
installed. This will help to scale the battery indicator correctly. The
options are:
- Alkaline
- Rechargeable